The answers you have received so far are accurate, in that getting the tapered shafts out of their sockets is sometimes hard work.
You can rent tools from local parts companies, buy a tool or try hammering them yourself. Heat does work well in that with the idea of expanding the "receptacle" enough to let-go of the tapered insert.
Often, a lot of techs simply repeatedly hammer all around the area to influence a release, if you will. Sometimes it takes a lot of hammering.
If it were me, I would try the hammering and heat, if that didn't work I'd seriously consider renting a tool.
Hope this helps, keep us posted-
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